49 CFR 501.5 - Exercise of authority.
(a) All authorities lawfully vested in the Administrator and reserved to him/her in this Regulation or in other NHTSA directives may be exercised by the Deputy Administrator and, in the absence of both Officials, by the Chief Counsel, unless specifically prohibited.
(b) In exercising the powers and performing the duties delegated by this part, officers of the NHTSA and their delegates are governed by applicable laws, executive orders, regulations, and other directives, and by policies, objectives, plans, standards, procedures, and limitations as may be issued from time to time by or on behalf of the Secretary of Transportation, the Administrator, the Deputy Administrator and the Chief Counsel or, with respect to matters under their jurisdiction, by or on behalf of the Senior Associate Administrators, Associate Administrators, Regional Administrators, and Directors of Staff Offices.
(c) Each officer to whom authority is delegated by this part may redelegate and authorize successive redelegations of that authority subject to any conditions the officer prescribes. Redelegations of authority shall be in written form and shall be published in the Federal Register when they affect the public.
(d) Each officer to whom authority is delegated will administer and perform the functions described in the officer's respective functional statements.